Wrench.



S. NOGRADY'.. WRENCH. APPuCATmN mw Nov. 1. 191s.

nrrn sanne rannr irren.

STEPHEN NOGRADY, vOli 'CI-IICAG,` ILLINOIS.

Wannen.

Specification of Letters Patent.

Patented fully 1'?, 191'?.

.Application Ied November 7, 1916. Serial No. 130,012.

improvements in wrenches.

An object of the invention 1s to provide ajwrench which embodies a fixed outer jaw and a spring pressed inner jaw, the inner jaw being normally forced outwardly and having associated therewith a shank threaded over a portion ofr its side whereby when moved to the desired position the threads thereof may be disengaged from` threads upon the movable inner jaw whereby the spring therefor may force the inner jaw `outwardly into gripping engagement with an object, and at which time the said threadedshank may be rotated to cause the threads thereof to engage threads on the movable jaw to lock the saine in adjusted position.

A further object of the invention is to provide a wrench of the type above set forth that is entirely automatic in its operation, z'. e., the constant tension upon the inner jaw and the return to operative position of the threaded shank to engagement with the threaded inner jaw.

With these general objects in view and others that will appear'as the nature of the invention is better understood, the saine consists in the novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawing and then claimed. Y

In the drawing forming a part of this application and in which like designating characters refer to corresponding parts throughout the several viewsz Figure 1 is a side elevational view, partly in section and with portions removed of a wrench constructed in accordance with the present invention.

Fig. 2 is a rear elevational view thereof.

Fig. 3 is a cross sectional view `taken on line III-III of Fig. 1 showing the Inanner of retaining the locking` threaded shank in position in the wrench. Y

Fig. 4L is a cross sectional view taken on line IV-IV of Fig. 1 showing the locking connection between the threaded shank and the inner face of the inner movable jaw.

Fig. 5 is a similar view with the locking threaded shank partially rotated to disengaged position from the jaw.

Fig. 6 is a cross sectional View taken onA line VI-VI of Fig. 1, showing the manner o f placing the threaded'shank under tension, and

Fig. 7 is a detail perspective view of the inner end of Vthe locking threaded shank.

Referring more in detail to the accompanylng drawing, the reference numeral 1() designates the frame or body portion of the wrench which is of U-shape in cross section, as clearly shown in Figs. 4 and 5, a fixed vjaw 11 being carried by the outer end thereof while a bolt 12 projects from the inner end for the reception of a handle 13' retained in position by shownin Figs. 1 and 2.

A sliding inner jaw 15 having a rectangular opening through the main body portion thereof is slidably mounted on the U-shaped frame 10, the inner jaw including a rearwardly projecting portion 16 having an opening therein through which projects a rod 17 arranged parallel to the frame 10, the said rod having threaded engagement at its outer end as at 18 with the outer fixed jaw 1l while the inner end thereof projects through a rearward extension 19 upon the frame l0, the inner end of the rod 17 including a slotted head 2O by which the said rod may be threaded into the outer jaw 11. An expansion coil spring 21 surrounds the rod 17 intermediate the rearward extension the end cap 14: as

16 uponthe inner jaw and the extension 19 upon the frame 10 so that the inner jaw 15 is'at all times spring-pressed outwardly.

Means is provided for holding the inner jaw 15in adjusted position and includes a shank 22 having corrugations or threads 23 formed upon a single longitudinal side face thereof as is clearly shown in Figs. 4 to 7, the outer end thereof being reduced as at 2a to be journaled in the outer Xed jaw l1 and retained in such position by the set screw 25 which engages the same in such manner as to permit a free rotation thereof. rIhe inner end 'of the shank 22 is reduced as at 26 and is adapted to be journaled in portions 27 of the frame 10. A coil spring 28 surrounds the reduced portion 26 and has one end connected thereto as at 29 while the other end is engaged in the frame 10 as indicated at 30. The inner face of the inner movable jaw 15 has one side thereof provided with rack teeth or threads Sl'that-areA prising a wrench frame U-shaped in cross adapted to be normally engaged by the section, ayj;aw iXed to the outer end thereof,

threads 23 upon the shank 22, this cona handle carried by the inner end of said nection being eieoted by the spring 28 nora frame, rearward extensions upon said frame Inally holding the threads in engagement'hnd outer jaw, a rod passed through said 'As shownin- Fig. 6, a removable oover'plate 33 is provided for the lower end of the wrench frame 101 which will house the shank operating spring 28 to protect the same from injury. v

When it is desired to disconnectA the intery engaging-threadsyfor purposes ofV adjustthe jaw 15, the shank 22 may be partially rotated against the tension of the spring 28 by engagement with the finger *gripy 32 to rotate. the shank so that the threads are disengaged and at which time v the spring 2l will" force the jaw l5V outwardly linto engagement with the member A. When the j aw 15 so engages the member A,

' pressure on the finger grip 32 may Ybe released and the spring 28 will rotate the ishani22 so that the threads 23 thereof engage the threads 3l upon the movable jaw ,to retain the same infradjusted position.

In `a )device of the class desorib'ed come 4*(fr11i'-esoikY this patent may be obtained for` frame extension and threaded into saidv jaw extension,4 ak sliding inner jaw mounted on said U-shaped frame and rod, an expansion coil spring surrounding said' rodv between the frame extension and the inner movable jaw, a shank having threads on one side face thereof journaled at its outer end in said` outer fixed jawV and at its inner end in saidY jaw frame, threads upon one side Jface of said inner jaw adapted' to be engaged by the threads on said shanlg a coil spring surrounding the inner end of said threaded shank, connected at one of its ends to said shank and at itsl other end to said jaw frame whereby the threaded shank is 'normally heldv in position whereby the threads. thereof engage the threads of the inner jaw,y andmeans for moving the shank against the ten-sion ofthe spring to disconnect the engaging threads.

, In testimony whereof I aiiix my signature.

Y STEPHEN NOGRADY.

ve centseach, byaddressing the Commissioner of Patents, Washington, D- 0,. 

